Hugh lancelot aldis



NH. L. .ALDIS. PHGTOGRAPHIG LENS.

f No. 560,460. Patented May 19, 1896.

` UNITED STATES PATENT OEEicE. f

lllGll LANCELOT ALDIS, OF LONDON, ENGLAND.

PHoToeRAPi-uo LENS.

L SPECIFICATION forming part of Letters Patent No. 560,460, dated May 19, 1896. Application filed September 20, 1895. Serial No. 563,084. (No model.)

To all whom ift may concern: The distances i1 to is between the surfaces t fj lle itknown that I, HUGH LAXCELOT ALDIS, are as follows: secretary of J. Il. Dallnieyer, L iinited, asub-V luche, mmm Indie, g icct of the Queen of Great Britain, residing 1: G0 4: 120 1: Q0 55 v 5 at 25 Newman Street, London in the countv 'Q .u 5 .Q l L .-0 f.- .89 .Do of Middlesex,England,have inventedcertain 3: 113 6: 35 i I new and useful Improvements in Pliotographic Lenses, of which the following is a T110 1`GPlCUVG UldlCCS 0f the glaSSeS fertile speccatimh D and II hues of the spectrum, respectively, 60

io The lens forming the subject of this inven- W0 ils fOHOWS tion is inadeup ot two compound lenses, the u for D u fm. H 0l. front one being a deep, strongly-converging una (Hina incniscus lens with strong positive spherical I l 3m 1 5,1 L aberration, but. being approximately correct II lfrLn'q 1' 5300 65. i 5 for chromatic aberration, while the rear one IH l'' li. 'l'fqn is a diverging system with strong negative Y m l'gg'l spherical aberration to correct the positive aberration of thc front lens and also appi'oxiln the lens shown at Fig. 2 the radii of mately correct for chromatic aberration, the curvature of the surfaces r1 to rs are as follows: 70 2o whole forming a converging system correct Inches. Inches. Inches. for spherical and chromatic aberrations and 1 .4 .1 r f f d. t t. 7 1.10 1 +4.01.) 1 ,.)ho l?? 10m 1S O1 .m' gzncarlyplano V5: +1.000() TR: +1.81

ihe front lens is preferably made of two q( qll.-i) -\l.. lenses cemented together as follows: the first .7 5 2 5 a converging lens of high refractive index, The dlSmCeS t0 f' between the surfaces while the other is a diverging lens of about me aS follOWSr the saine refractive index as the converging Chee haies, 111cm, lens. In sonic cases it is necessary to cement fi: 30 4: 19 fr: 5i behind these a converging ineniscus, also of 2: ()5 f5: 1o 8O i 3o about the saine refractive index as the other in: 5U in: g1g

two. The rear lens consists of two lenses scpf Y, mmted by L Smau my spuca The from; 10H5 lhe reiraeiii e indices of t-lie glasses are as is a thicl; nearly plano-convex lens of high refollows:

ifi-active index, and the rear lens a diver-ging u for D 11 for ll 35 3 5 concave-convex lens of low refractive index. line. line. Preferably, however, either or both of these I and 1H 1 572; 1 5S53U i lenses may be themselves double cemented H 1 5733 159mg @Omlnfllons 0f fi dl'elglg lens 0f 10W ,1'0' 1v and v 1.51m Lacona i fraetive index and aconverging lens of high Focal length 9 inches. 9o

4o refractive index. 1 or sonic purposes the whole lens may be turned around end for end. What l claini is Figure 1 is a longitudinal section of a lens l. A converging lens made up of two conimade according to this invention, and Fig. l pound lenscsoue a deep convergingnieniscus v is a similar view of a modification. with strong positive spherical aberration con- 95 1 45 In the lens shown in Fig. l the radii of taining aconverging andadivcrgiug compocurvature oitliesurfaces r to rfarc as follows: nent both of high refractive index and the other a diverging system with strongnegative Inches. Inches. Inches. abcii'ltlOn. y r1: -.l5 rl: -Jfjll rl: +1.55 I 2. A converging lens inade up of two eoniioo "i 5o ["1: +1.53 rl: +.l:' rs: -QJS-t pound lensesoneadeep'convergingineniscus 13:; -QAJ +2.64 2: +3.77 with strong positive spherical aberration eon- 5 are of low and the converging components of 'high refractive index.

A converging lens made up of two compound lenses one a deep converging meniseus with strong positive spherical aberration con- Io taining a converging and a diverging component both of high refractive index and the other a divergin g system with strong negative aberration made up of a thick nearly planoconvex lens an air-space and a concave-coni 5 vex lens, the diverging components being of low and the converging components of high refractive index.

4. A converging lens made up of two compound lenses one a deep converging nicniseus 2o with strong positive spherical aberration containing a converging and a diverging component both of high refractive index and the other a diverging system .with strong negative aberration made up of a thick nearly planoconvex lens, an air-space, a double concave lens, and a double convex lens, the diverging components being of low and the converging components of high refractive index.

5. A converging lens made up of two compound lenses one a deep converging nieniscus with strong positive spherical aberration containing a converging and a diver-ging component both of high refractive index and the other a divergin g system with strong negative aberration made up of a converging lens, a diverging lens, an air-space and a diverging lens the diverging components being of low and the converging components of high refractive index.

HUGH LANCELOT ALDIs.

Witnesses:

JOSEPH LAKE, -W. PERCY CARPINAEL.

It is hereby certified that in Letters Patent No. 560,460, granted May 19, 1896, up the application of Hugh Lancelot Aldis, of London, England, for an improvement Photographie Lenses, errorsl appear in the printed specification requiring eorreeti as follows: On page 1, line 60, the Greek letter y should follow the English capi letter lH, and in lines 62 and S-in the captions u for D and u for H7-the Gre letter /t should be'substituted for the English u, and the Greek y should followt English capital H; and that the said Letters Patent should be read With these Corr tions therein that the same may conform to the record of the oase in the Patent Oi Signed, eountersigned, and sealed this 11th day of August, A. D., 1896.

JNO. M. REYNOLDS, Assistant Secretary of the Interior [SEAL] Countersigned:

JOHN S. SEYMOUR,

Commissioner of Patents. 

